Absolutely not. I like postfix its simple enough, I understand the configs, and
it has yet to let me down. So I will need this on all the servers to send mail
and logs for various services. FreeBSD ships with sendmail so we will need to
stop that as well.

Install postfix:

cd /usr/ports/mail/postfix-current
make install clean

Make sure we select the options we need here like SSL and SASL.

Then we need to stop sendmail

/etc/rc.d/sendmail stop

Now we need to make some changes to /etc/rc.conf so that the system uses postfix
instead of sendmail.